package cn.byapps.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import cn.byapps.entity.User;

/**
 * 教师登录拦截
 * 
 */
public class LoginInterceptor implements HandlerInterceptor {
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object arg2) throws Exception {
		Object obj = request.getSession().getAttribute("loginUser");
		if (obj != null && obj instanceof User) {// 登陆成功---放行
			return true;
		}
		String uri = request.getContextPath();
		response.sendRedirect(uri + "/");
		return false;
	}

	@Override
	public void afterCompletion(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {

	}

	@Override
	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2, ModelAndView arg3)
			throws Exception {

	}

}
